.box {
  height: 30px;
  line-height: 30px;
  margin-top: 30px;
  margin-bottom: 2px;
}
.box ul li {
  float: left;
  padding: 0 15px;
}
.box ul li:nth-child(-n + 3) {
  font-size: 16px;
  font-weight: 700;
}

.dt ul li {
  /* position: relative; */
  width: 290px;
  height: 455px;
  overflow: hidden;
}
.dt ul li .kd {
  height: 52px;
  transition: all 0.5s;
  /* overflow: hidden; */
}
.dt ul li a {
  /* position: absolute; */
  width: 290px;
  height: 50px;
  background-color: red;
  line-height: 50px;
  text-align: center;
  font-size: 20px;
  color: #fff;
  font-weight: 700;
  display: block;
  transition: all 1s;
}
/* .dt ul li:hover a {
  left: 0;
  bottom: 50px;
} */
.dt ul li:hover .kd {
  height: 0;
}
/* .dt ul li:hover {
  border: 1px solid red;
} */
